Corn root drill safety zones

The western corn root drill comes from North America and is the most important maize pest there. In the 1990s, the beetle was transported to Europe. In Switzerland, the pest has not been able to establish itself thanks to the crop rotation system and is therefore still a quarantine organism and is monitored annually with pheromone traps. The cantonal plant protection services set traps every year over the summer, mainly in the maize growing areas. Since 2020, the traps have been distributed in a grid pattern. If maize rootworms are caught, it is mandatory to follow a crop rotation restriction (grain cultivation on maize prohibited) within a radius of ten kilometres around the trap location (safety zone). The present polygon data set "corn root drill safety zones" represents the safety zones around the corn root drill sites of the respective year. In these safety zones, the cultivation of maize on maize for farmers is prohibited in the following year.西方玉米根萤叶甲（Western corn root drill）原产于北美洲，是当地最为重要的玉米害虫。20世纪90年代，该甲虫被传入欧洲。在瑞士，得益于轮作制度，该害虫未能成功定殖，因此目前仍属于检疫性有害生物，每年均通过性信息素诱捕器开展监测工作。瑞士各州植物保护服务机构每年夏季都会布设诱捕器，布设区域主要覆盖玉米种植区。自2020年起，诱捕器采用网格化布局方式进行布设。若诱捕到玉米根萤叶甲，则必须在诱捕点周边10公里范围内（即安全区）执行轮作限制措施（禁止在玉米地块种植谷物）。本多边形数据集"玉米根萤叶甲安全区"记录了对应年度各玉米根萤叶甲诱捕点周边的安全区范围。在上述安全区内，农户次年不得进行玉米连作种植。